diff mbox

[5/5] Input: wacom_w8001 - split the touch and pen devices into two devices

Message ID 1448854696-32625-5-git-send-email-peter.hutterer@who-t.net (mailing list archive)
State Superseded
Headers show

Commit Message

Peter Hutterer Nov. 30, 2015, 3:38 a.m. UTC 
These devices have a pen device and a touch device through the same serial
protocol, split it up into two separate devices like we do for USB Wacom
tablets too.

Userspace already matches on the device name so we can't drop it
completely. Compose the same basename based on capabilities and append the
tool type, leading to a name like "Wacom Serial Penabled 2FG Touchscreen
Pen".

Note that this drops BTN_TOOL_FINGER, it is not needed once the tools are
split out (and a touch device with BTN_TOOL_FINGER is interpreted as
touchpad by most of userspace).

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
---
 drivers/input/touchscreen/wacom_w8001.c | 163 ++++++++++++++++++++++----------
 1 file changed, 112 insertions(+), 51 deletions(-)

Comments

Dmitry Torokhov Dec. 1, 2015, 10:06 p.m. UTC | #1 
On Mon, Nov 30, 2015 at 01:38:16PM +1000, Peter Hutterer wrote:
> These devices have a pen device and a touch device through the same serial
> protocol, split it up into two separate devices like we do for USB Wacom
> tablets too.
> 
> Userspace already matches on the device name so we can't drop it
> completely. Compose the same basename based on capabilities and append the
> tool type, leading to a name like "Wacom Serial Penabled 2FG Touchscreen
> Pen".
> 
> Note that this drops BTN_TOOL_FINGER, it is not needed once the tools are
> split out (and a touch device with BTN_TOOL_FINGER is interpreted as
> touchpad by most of userspace).
> 
> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
> Acked-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
> ---
>  drivers/input/touchscreen/wacom_w8001.c | 163 ++++++++++++++++++++++----------
>  1 file changed, 112 insertions(+), 51 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/wacom_w8001.c b/drivers/input/touchscreen/wacom_w8001.c
> index 363e510..9efc7ec 100644
> --- a/drivers/input/touchscreen/wacom_w8001.c
> +++ b/drivers/input/touchscreen/wacom_w8001.c
> @@ -80,7 +80,8 @@ struct w8001_touch_query {
>   */
>  
>  struct w8001 {
> -	struct input_dev *dev;
> +	struct input_dev *pen_dev;
> +	struct input_dev *touch_dev;
>  	struct serio *serio;
>  	struct completion cmd_done;
>  	int id;
> @@ -95,7 +96,10 @@ struct w8001 {
>  	u16 max_touch_y;
>  	u16 max_pen_x;
>  	u16 max_pen_y;
> -	char name[64];
> +	char pen_name[64];
> +	char touch_name[64];
> +	int open_count;
> +	struct mutex mutex;
>  };
>  
>  static void parse_pen_data(u8 *data, struct w8001_coord *coord)
> @@ -141,7 +145,7 @@ static void scale_touch_coordinates(struct w8001 *w8001,
>  
>  static void parse_multi_touch(struct w8001 *w8001)
>  {
> -	struct input_dev *dev = w8001->dev;
> +	struct input_dev *dev = w8001->touch_dev;
>  	unsigned char *data = w8001->data;
>  	unsigned int x, y;
>  	int i;
> @@ -207,7 +211,7 @@ static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
>  
>  static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
>  {
> -	struct input_dev *dev = w8001->dev;
> +	struct input_dev *dev = w8001->pen_dev;
>  
>  	/*
>  	 * We have 1 bit for proximity (rdy) and 3 bits for tip, side,
> @@ -233,11 +237,6 @@ static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
>  		break;
>  
>  	case BTN_TOOL_FINGER:
> -		input_report_key(dev, BTN_TOUCH, 0);
> -		input_report_key(dev, BTN_TOOL_FINGER, 0);
> -		input_sync(dev);
> -		/* fall through */
> -
>  	case KEY_RESERVED:
>  		w8001->type = coord->f2 ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
>  		break;
> @@ -261,7 +260,7 @@ static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
>  
>  static void report_single_touch(struct w8001 *w8001, struct w8001_coord *coord)
>  {
> -	struct input_dev *dev = w8001->dev;
> +	struct input_dev *dev = w8001->touch_dev;
>  	unsigned int x = coord->x;
>  	unsigned int y = coord->y;
>  
> @@ -271,7 +270,6 @@ static void report_single_touch(struct w8001 *w8001, struct w8001_coord *coord)
>  	input_report_abs(dev, ABS_X, x);
>  	input_report_abs(dev, ABS_Y, y);
>  	input_report_key(dev, BTN_TOUCH, coord->tsw);
> -	input_report_key(dev, BTN_TOOL_FINGER, coord->tsw);
>  
>  	input_sync(dev);
>  
> @@ -369,20 +367,33 @@ static int w8001_command(struct w8001 *w8001, unsigned char command,
>  static int w8001_open(struct input_dev *dev)
>  {
>  	struct w8001 *w8001 = input_get_drvdata(dev);
> +	int err;
>  
> -	return w8001_command(w8001, W8001_CMD_START, false);
> +	err = mutex_lock_interruptible(&w8001->mutex);
> +	if (err)
> +		return err;
> +
> +	if (w8001->open_count++ == 0)
> +		err = w8001_command(w8001, W8001_CMD_START, false);

We leak the count in case of error here. You need something like:

static int w8001_open(struct input_dev *dev)
{
	struct w8001 *w8001 = input_get_drvdata(dev);
	int retval;

	retval = mutex_lock_interruptible(&w8001->mutex);
	if (retval)
		return retval;

	if (w8001->open_count++ == 0) {
		retval = w8001_command(w8001, W8001_CMD_START, false);
		if (retval)
			w8001->open_count--;
	}

	mutex_unlock(&w8001->mutex);
	return retval;
}

Thanks.
diff mbox

Patch

diff --git a/drivers/input/touchscreen/wacom_w8001.c b/drivers/input/touchscreen/wacom_w8001.c
index 363e510..9efc7ec 100644
--- a/drivers/input/touchscreen/wacom_w8001.c
+++ b/drivers/input/touchscreen/wacom_w8001.c
@@ -80,7 +80,8 @@  struct w8001_touch_query {
  */
 
 struct w8001 {
-	struct input_dev *dev;
+	struct input_dev *pen_dev;
+	struct input_dev *touch_dev;
 	struct serio *serio;
 	struct completion cmd_done;
 	int id;
@@ -95,7 +96,10 @@  struct w8001 {
 	u16 max_touch_y;
 	u16 max_pen_x;
 	u16 max_pen_y;
-	char name[64];
+	char pen_name[64];
+	char touch_name[64];
+	int open_count;
+	struct mutex mutex;
 };
 
 static void parse_pen_data(u8 *data, struct w8001_coord *coord)
@@ -141,7 +145,7 @@  static void scale_touch_coordinates(struct w8001 *w8001,
 
 static void parse_multi_touch(struct w8001 *w8001)
 {
-	struct input_dev *dev = w8001->dev;
+	struct input_dev *dev = w8001->touch_dev;
 	unsigned char *data = w8001->data;
 	unsigned int x, y;
 	int i;
@@ -207,7 +211,7 @@  static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
 
 static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
 {
-	struct input_dev *dev = w8001->dev;
+	struct input_dev *dev = w8001->pen_dev;
 
 	/*
 	 * We have 1 bit for proximity (rdy) and 3 bits for tip, side,
@@ -233,11 +237,6 @@  static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
 		break;
 
 	case BTN_TOOL_FINGER:
-		input_report_key(dev, BTN_TOUCH, 0);
-		input_report_key(dev, BTN_TOOL_FINGER, 0);
-		input_sync(dev);
-		/* fall through */
-
 	case KEY_RESERVED:
 		w8001->type = coord->f2 ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
 		break;
@@ -261,7 +260,7 @@  static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
 
 static void report_single_touch(struct w8001 *w8001, struct w8001_coord *coord)
 {
-	struct input_dev *dev = w8001->dev;
+	struct input_dev *dev = w8001->touch_dev;
 	unsigned int x = coord->x;
 	unsigned int y = coord->y;
 
@@ -271,7 +270,6 @@  static void report_single_touch(struct w8001 *w8001, struct w8001_coord *coord)
 	input_report_abs(dev, ABS_X, x);
 	input_report_abs(dev, ABS_Y, y);
 	input_report_key(dev, BTN_TOUCH, coord->tsw);
-	input_report_key(dev, BTN_TOOL_FINGER, coord->tsw);
 
 	input_sync(dev);
 
@@ -369,20 +367,33 @@  static int w8001_command(struct w8001 *w8001, unsigned char command,
 static int w8001_open(struct input_dev *dev)
 {
 	struct w8001 *w8001 = input_get_drvdata(dev);
+	int err;
 
-	return w8001_command(w8001, W8001_CMD_START, false);
+	err = mutex_lock_interruptible(&w8001->mutex);
+	if (err)
+		return err;
+
+	if (w8001->open_count++ == 0)
+		err = w8001_command(w8001, W8001_CMD_START, false);
+
+	mutex_unlock(&w8001->mutex);
+	return err;
 }
 
 static void w8001_close(struct input_dev *dev)
 {
 	struct w8001 *w8001 = input_get_drvdata(dev);
 
-	w8001_command(w8001, W8001_CMD_STOP, false);
+	mutex_lock(&w8001->mutex);
+
+	if (--w8001->open_count == 0)
+		w8001_command(w8001, W8001_CMD_STOP, false);
+
+	mutex_unlock(&w8001->mutex);
 }
 
 static int w8001_detect(struct w8001 *w8001)
 {
-	struct input_dev *dev = w8001->dev;
 	int error;
 
 	error = w8001_command(w8001, W8001_CMD_STOP, false);
@@ -391,18 +402,13 @@  static int w8001_detect(struct w8001 *w8001)
 
 	msleep(250);	/* wait 250ms before querying the device */
 
-	__set_bit(EV_KEY, dev->evbit);
-	__set_bit(EV_ABS, dev->evbit);
-	strlcat(w8001->name, "Wacom Serial", sizeof(w8001->name));
-
-	__set_bit(INPUT_PROP_DIRECT, dev->propbit);
-
 	return 0;
 }
 
-static int w8001_setup_pen(struct w8001 *w8001)
+static int w8001_setup_pen(struct w8001 *w8001, char *basename,
+			   size_t basename_sz)
 {
-	struct input_dev *dev = w8001->dev;
+	struct input_dev *dev = w8001->pen_dev;
 	struct w8001_coord coord;
 	int error;
 
@@ -411,11 +417,14 @@  static int w8001_setup_pen(struct w8001 *w8001)
 	if (error)
 		return error;
 
+	__set_bit(EV_KEY, dev->evbit);
+	__set_bit(EV_ABS, dev->evbit);
 	__set_bit(BTN_TOUCH, dev->keybit);
 	__set_bit(BTN_TOOL_PEN, dev->keybit);
 	__set_bit(BTN_TOOL_RUBBER, dev->keybit);
 	__set_bit(BTN_STYLUS, dev->keybit);
 	__set_bit(BTN_STYLUS2, dev->keybit);
+	__set_bit(INPUT_PROP_DIRECT, dev->propbit);
 
 	parse_pen_data(w8001->response, &coord);
 	w8001->max_pen_x = coord.x;
@@ -432,14 +441,15 @@  static int w8001_setup_pen(struct w8001 *w8001)
 	}
 
 	w8001->id = 0x90;
-	strlcat(w8001->name, " Penabled", sizeof(w8001->name));
+	strlcat(basename, " Penabled", basename_sz);
 
 	return 0;
 }
 
-static int w8001_setup_touch(struct w8001 *w8001)
+static int w8001_setup_touch(struct w8001 *w8001, char *basename,
+			     size_t basename_sz)
 {
-	struct input_dev *dev = w8001->dev;
+	struct input_dev *dev = w8001->touch_dev;
 	struct w8001_touch_query touch;
 	int error;
 
@@ -455,8 +465,10 @@  static int w8001_setup_touch(struct w8001 *w8001)
 	if (!w8001->response[1])
 		return 1;
 
+	__set_bit(EV_KEY, dev->evbit);
+	__set_bit(EV_ABS, dev->evbit);
 	__set_bit(BTN_TOUCH, dev->keybit);
-	__set_bit(BTN_TOOL_FINGER, dev->keybit);
+	__set_bit(INPUT_PROP_DIRECT, dev->propbit);
 
 	parse_touchquery(w8001->response, &touch);
 	w8001->max_touch_x = touch.x;
@@ -479,14 +491,14 @@  static int w8001_setup_touch(struct w8001 *w8001)
 	case 2:
 		w8001->pktlen = W8001_PKTLEN_TOUCH93;
 		w8001->id = 0x93;
-		strlcat(w8001->name, " 1FG", sizeof(w8001->name));
+		strlcat(basename, " 1FG", basename_sz);
 		break;
 
 	case 1:
 	case 3:
 	case 4:
 		w8001->pktlen = W8001_PKTLEN_TOUCH9A;
-		strlcat(w8001->name, " 1FG", sizeof(w8001->name));
+		strlcat(basename, " 1FG", basename_sz);
 		w8001->id = 0x9a;
 		break;
 
@@ -502,7 +514,7 @@  static int w8001_setup_touch(struct w8001 *w8001)
 		input_set_abs_params(dev, ABS_MT_TOOL_TYPE,
 					0, MT_TOOL_MAX, 0, 0);
 
-		strlcat(w8001->name, " 2FG", sizeof(w8001->name));
+		strlcat(basename, " 2FG", basename_sz);
 		if (w8001->max_pen_x && w8001->max_pen_y)
 			w8001->id = 0xE3;
 		else
@@ -510,11 +522,27 @@  static int w8001_setup_touch(struct w8001 *w8001)
 		break;
 	}
 
-	strlcat(w8001->name, " Touchscreen", sizeof(w8001->name));
+	strlcat(basename, " Touchscreen", basename_sz);
 
 	return 0;
 }
 
+static void w8001_set_devdata(struct input_dev *dev, struct w8001 *w8001,
+			      struct serio *serio)
+{
+	dev->phys = w8001->phys;
+	dev->id.bustype = BUS_RS232;
+	dev->id.product = w8001->id;
+	dev->id.vendor = 0x056a;
+	dev->id.version = 0x0100;
+	dev->open = w8001_open;
+	dev->close = w8001_close;
+
+	dev->dev.parent = &serio->dev;
+
+	input_set_drvdata(dev, w8001);
+}
+
 /*
  * w8001_disconnect() is the opposite of w8001_connect()
  */
@@ -525,7 +553,10 @@  static void w8001_disconnect(struct serio *serio)
 
 	serio_close(serio);
 
-	input_unregister_device(w8001->dev);
+	if (w8001->pen_dev)
+		input_unregister_device(w8001->pen_dev);
+	if (w8001->touch_dev)
+		input_unregister_device(w8001->touch_dev);
 	kfree(w8001);
 
 	serio_set_drvdata(serio, NULL);
@@ -540,18 +571,23 @@  static void w8001_disconnect(struct serio *serio)
 static int w8001_connect(struct serio *serio, struct serio_driver *drv)
 {
 	struct w8001 *w8001;
-	struct input_dev *input_dev;
+	struct input_dev *input_dev_pen;
+	struct input_dev *input_dev_touch;
+	char basename[64];
 	int err, err_pen, err_touch;
 
 	w8001 = kzalloc(sizeof(struct w8001), GFP_KERNEL);
-	input_dev = input_allocate_device();
-	if (!w8001 || !input_dev) {
+	input_dev_pen = input_allocate_device();
+	input_dev_touch = input_allocate_device();
+	if (!w8001 || !input_dev_pen || !input_dev_touch) {
 		err = -ENOMEM;
 		goto fail1;
 	}
 
 	w8001->serio = serio;
-	w8001->dev = input_dev;
+	w8001->pen_dev = input_dev_pen;
+	w8001->touch_dev = input_dev_touch;
+	mutex_init(&w8001->mutex);
 	init_completion(&w8001->cmd_done);
 	snprintf(w8001->phys, sizeof(w8001->phys), "%s/input0", serio->phys);
 
@@ -564,38 +600,63 @@  static int w8001_connect(struct serio *serio, struct serio_driver *drv)
 	if (err)
 		goto fail3;
 
-	err_pen = w8001_setup_pen(w8001);
-	err_touch = w8001_setup_touch(w8001);
+	/* For backwards-compatibility we compose the basename based on
+	 * capabilities and then just append the tool type
+	 */
+	strlcpy(basename, "Wacom Serial", sizeof(basename));
+
+	err_pen = w8001_setup_pen(w8001, basename, sizeof(basename));
+	err_touch = w8001_setup_touch(w8001, basename, sizeof(basename));
 	if (err_pen && err_touch) {
 		err = (err_touch == 1) ? err_pen : err_touch;
 		goto fail3;
 	}
 
-	input_dev->name = w8001->name;
-	input_dev->phys = w8001->phys;
-	input_dev->id.product = w8001->id;
-	input_dev->id.bustype = BUS_RS232;
-	input_dev->id.vendor = 0x056a;
-	input_dev->id.version = 0x0100;
-	input_dev->dev.parent = &serio->dev;
+	if (!err_pen) {
+		strlcpy(w8001->pen_name, basename, sizeof(w8001->pen_name));
+		strlcat(w8001->pen_name, " Pen", sizeof(w8001->pen_name));
+		input_dev_pen->name = w8001->pen_name;
 
-	input_dev->open = w8001_open;
-	input_dev->close = w8001_close;
+		w8001_set_devdata(input_dev_pen, w8001, serio);
 
-	input_set_drvdata(input_dev, w8001);
+		err = input_register_device(w8001->pen_dev);
+		if (err)
+			goto fail3;
+	} else {
+		input_free_device(input_dev_pen);
+		input_dev_pen = NULL;
+		w8001->pen_dev = NULL;
+	}
 
-	err = input_register_device(w8001->dev);
-	if (err)
-		goto fail3;
+	if (!err_touch) {
+		strlcpy(w8001->touch_name, basename, sizeof(w8001->touch_name));
+		strlcat(w8001->touch_name, " Finger",
+			sizeof(w8001->touch_name));
+		input_dev_touch->name = w8001->touch_name;
+
+		w8001_set_devdata(input_dev_touch, w8001, serio);
+
+		err = input_register_device(w8001->touch_dev);
+		if (err)
+			goto fail4;
+	} else {
+		input_free_device(input_dev_touch);
+		input_dev_touch = NULL;
+		w8001->touch_dev = NULL;
+	}
 
 	return 0;
 
+fail4:
+	if (w8001->pen_dev)
+		input_unregister_device(w8001->pen_dev);
 fail3:
 	serio_close(serio);
 fail2:
 	serio_set_drvdata(serio, NULL);
 fail1:
-	input_free_device(input_dev);
+	input_free_device(input_dev_pen);
+	input_free_device(input_dev_touch);
 	kfree(w8001);
 	return err;
 }